164968565 has 8 divisors (see below), whose sum is σ = 198040248. Its totient is φ = 131922880.

The previous prime is 164968553. The next prime is 164968567. The reversal of 164968565 is 565869461.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 77284 + 164891281 = 278^2 + 12841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164968565 - 2¹⁴ = 164952181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164968567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12539 + ... + 22071.

It is an arithmetic number, because the mean of its divisors is an integer number (24755031).

Almost surely, 2^164968565 is an apocalyptic number.

It is an amenable number.

164968565 is a deficient number, since it is larger than the sum of its proper divisors (33071683).

164968565 is an equidigital number, since it uses as much as digits as its factorization.

164968565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12999.

The product of its digits is 1555200, while the sum is 50.

The square root of 164968565 is about 12844.0089146652. The cubic root of 164968565 is about 548.4458217394.

The spelling of 164968565 in words is "one hundred sixty-four million, nine hundred sixty-eight thousand, five hundred sixty-five".